if you are using jquery-ui 1.11.4:
var tooltip = $.widget( "ui.tooltip", {
version: "1.11.4",
options: {
content: function() {
// support: IE<9, Opera in jQuery <1.7
// .text() can't accept undefined, so coerce to a string
var title = $( this ).attr( "title" ) || "";
// Escape title, since we're going from an attribute to raw HTML
Replace--> //return $( "" ).text( title ).html();
by --> return $( "" ).html( title );
},